Bend your elbows and slowly curl the weights ... and then slowly lower them until your arms straighten. Barbell curls: Stand ...

Barbell curls are a classic mass-building exercise ... Hold a dumbbell in each hand and hinge at your hips, keeping your back flat. Bend your elbows to a 90-degree angle and extend your arms ...

Why: Swapping for a barbell will change your curl more than you might expect ... keeping your glutes and abs squeezed. Bend your elbows and bring your torso forward so your head dips under ...